| 摘要 |
NEW MATERIAL:A compound of formula I (R<1>, R<2> are H, hydroxyl; R<3> is H, acetyl; the bonds between the 4- and 5-positions and between the 5- and 6- positions are single or double where they are not double simultaneously). EXAMPLE:The compound of formula II. USE:A shark repellent: it is used in diving and fishing in the sea where sharks live. It has powerful toxicity against fishes. PREPARATION:Secretion of a marine organism (UMINOSHITA) is freeze-dried and extracted with an organic solvent such as acetone. Then, the extract is subjected to column chromatography fractionation and purification.
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